async getPool(){
let contract = 'TXk8rQSAvPvBBNtqSoY6nCfsXWCSSpTVQF'
let instance = await tronWeb.contract().at(contract)
let exchange = await instance.getExchange('TPZddNpQJHu8UtKPY1PYDBv2J5p5QpJ6XW').call()
// let exchange2 = this.tronWeb2.address.fromHex(exchange)
let poolcontract = 'TPt2a3GtKMY5972mWa2aL3KKVY6ScWX2G2'
let PoolInstance = await tronWeb.contract().at(poolcontract)
let balance = await PoolInstance.balanceOf('TPt2a3GtKMY5972mWa2aL3KKVY6ScWX2G2').call()
},